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    function fun1 () {
      return new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve('定时器第一个4s');
        }, 4000);
      })
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    function fun2 () {
      return new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve('定时器第一个3s');
        }, 3000);
      })
    }
    function fun3 () {
      return new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve('定时器第一个2s');
        }, 2000);
      })
    }
    async function show () {
      await fun1().then(data => {
        console.log(data);
      })
      await fun2().then(data => {
        console.log(data);
      })
      await fun3().then(data => {
        console.log(data);
      })
    }
    show()
  </script>
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